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Progress in science and the improvement of living conditions have led m the rapidgrowth of the world Modern medical science, for example, has made it possible for babies to grow up healthily and for people to live With improved living conditions, particularly in the countryside, people tend to have larger As a resuit, the world population has increased so rapidly that it has now exceeded 5 But the overgrowth of population presents a threat to the existence of human A large population demands a great deal of food supply and shelter However,the limited productivity and scarce natural resources can hardly meet the needs of the ever-Increasing Thus in the long run, the overgrowth of the world population will only harm To guarantee the steady development of human society, mankind must realize the consequences resulting from a fast population growth and the importance of carrying out a family planning Only by adopting effectual measures can human society de velop steadily and have a bright 控制人口 科学的进步和生活条件的改善导致了世界人口的迅速增长。譬如，现代医学可以使幼儿健康成长，使人们长寿。由于生活条件的改善，特别是农村生活条件的改善，家庭人门日渐增多。结果，世界人口增长如此迅猛以致于现在人口超过了50亿。 但是，人口过分增长对人类社会的存在构成了威胁。大量的人口需要大批的粮食供给和大量的住宅。然而，有限的生产能力和不足的自然资源几乎不能满足日益增长的人口的需要。因此，从长远的观点看，过多的世界人口将会危害人类。 为了保证人类社会的稳定发展，人类必须意识到人口迅速增长所造成的后果和执行计划生育方针的重要性。只有采取有效措施，人类社会才能稳步发展，才会有光明的未来。
The Problem of Human Population Directions: For this part, you are allowed 30 minutes to write a composition based on the following graph showing the growth of the world＇s The opening sentence is given and you are required to develop it into a full Your part of writing should be no less than 120 Some useful words and phrases are provided, but you do not have to include all of (Suggested words and phrases: birth control, death rate, population explosion, food shortage)The Problem of Human PopulationIt has been estimated that a thousand years ago there were less than 400 million people on Today, however, the world＇s population has amounted to 5,000 What is worse, it keeps growing at a surprising If this trend continues, the world＇s population will shoot up to 7,000 million by the year This is what we call population The rapid development of science and technology is the main cause of population We can see that the population has been growing at a tremendous speed since the Industrial and Agriculture Revolution in 1650, which raised the people＇s standard of living, and the emergence of modern medicine in 1550, which lowered the people＇s death Population explosion will result in a lot of such problems as food shortage, housing shortage and It is time that we acted quickly to carry out the policy of birth control otherwise, man＇s survival on the earth will be
OverpopulationOverpopulation is a condition where an organism's numbers exceed the carrying capacity of its In common parlance, the term usually refers to the relationship between the human population and its environment, the E[1]Overpopulation does not depend only on the size or density of the population, but on the ratio of population to available sustainable It also depends on the means of resources used and distributed throughout the If a given environment has a population of 10 individuals, but there is food or drinking water enough for only 9, then in a closed system where no trade is possible, that environment is overpopulated; if the population is 100 but there is enough food, shelter, and water for 200 for the indefinite future, then it is not Overpopulation can result from an increase in births, a decline in mortality rates due to medical advances, from an increase in immigration, or from an unsustainable biome and depletion of It is possible for very sparsely-populated areas to be overpopulated, as the area in question may have a meager or non-existent capability to sustain human life ( the middle of the Sahara Desert or Antarctica)The resources to be considered when evaluating whether an ecological niche is overpopulated include clean water, clean air, food, shelter, warmth, and other resources necessary to sustain If the quality of human life is addressed, there may be additional resources considered, such as medical care, education, proper sewage treatment and waste Overpopulation places competitive stress on the basic life sustaining resources, leading to a diminished quality of [2] Some countries have managed to increase their carrying capacity by using technologies such as modern agriculture, desalination, and nuclear
Look at your watch for just one During that time,The popuiation of the world increased by Perhaps you think that is Hoever,during the next hour,over15540 more babies will be born on the So it goes on,hour after In oneday,people have to produce food fover 370000 more Multiply this justthink how many more there will be in one year!What will happen in a hundred years? The increasing population may be the greatest challenge of the world The world's population is growing faster and Two thousang years ago,there only 250millon people on the At the beining of the20thcentury,the world'spopulation was about In 1990,it reached more than five Now at the beininjg of the 21stcentthe world's population has passed six people say that by the yeay 2010it may be seven That means in about 600 years,there will br standing room only on the Each person will have one half to one square metre of space to live There will be hardly enough space ror angbody It has been estimated that a thousand years ago there were less than 400 million people on However, in the recent thousand years human population has increased nearly 20 Nowadays the world population has reached more than 7000 The population explosion has caused many Generally, they come down to four major First, a lot of people can't get employment, which is a universal problem in the Second, in developing countries there are not enough shelters for too many people and so people are not properly housed and even are exposed to the Third, in underdeveloped countries a lot of people suffer from hunger because of food shortage, which in turn causes many other problems, malnutrition, disease, Fourth, there are not enough schools for so many people and so a lot of people are Therefore, to eliminate these problems, human beings should take effective measures to control
我觉得首先你可以介绍一些中国人口的特点，比如数量多，增长快，地域分布（密集，稀少），人口流动等等，可以和别的国家作比较。还可以加上“计划生育”这个国策的相关信息，这可是中国特有的哦
Progress in science and the improvement of living conditions have led m the rapidgrowth of the world Modern medical science, for example, has made it possible for babies to grow up healthily and for people to live With improved living conditions, particularly in the countryside, people tend to have larger As a resuit, the world population has increased so rapidly that it has now exceeded 5 But the overgrowth of population presents a threat to the existence of human A large population demands a great deal of food supply and shelter However,the limited productivity and scarce natural resources can hardly meet the needs of the ever-Increasing Thus in the long run, the overgrowth of the world population will only harm To guarantee the steady development of human society, mankind must realize the consequences resulting from a fast population growth and the importance of carrying out a family planning Only by adopting effectual measures can human society de velop steadily and have a bright 控制人口 科学的进步和生活条件的改善导致了世界人口的迅速增长。譬如，现代医学可以使幼儿健康成长，使人们长寿。由于生活条件的改善，特别是农村生活条件的改善，家庭人门日渐增多。结果，世界人口增长如此迅猛以致于现在人口超过了50亿。 但是，人口过分增长对人类社会的存在构成了威胁。大量的人口需要大批的粮食供给和大量的住宅。然而，有限的生产能力和不足的自然资源几乎不能满足日益增长的人口的需要。因此，从长远的观点看，过多的世界人口将会危害人类。 为了保证人类社会的稳定发展，人类必须意识到人口迅速增长所造成的后果和执行计划生育方针的重要性。只有采取有效措施，人类社会才能稳步发展，才会有光明的未来。
《人口研究》是人口学领域的顶刊，理论文章和数理文章兼收，更具学术性。《中国人口科学》缺乏理论文章，但是数理文章比《人口学刊》《人口与经济》水平更高一些。人口学期刊的排名是：《人口研究》（A）、《中国人口科学》（A-）、《人口学刊》（B）、《人口与经济》（B）、《人口与发展》（B-）、《南方人口》（C）、《西北人口》（C）、《人口与社会》（D）。
毫无疑问，中国人口科学人口学期刊排名第一，社科院人口所的杂志。几乎在所有的高校中中国人口科学都是B类权威期刊，人口研究偏数理。从发表难度来看，中国人口科学录用率不超过10%，人口研究在20%左右。
6亿人口
The population in China has stood at。。。It cause serious First ,the enviroment is seriously For example,air quality in most cities is beyond the legal standard,post threat to people's What's more,traffic congestion and rising criminal In rural area,it increase the requirement for the yield of agricultural In order to solve the asures should be First,curb the increasing speed of population by education and Second,government need to improve its service to adapt to the situation
Look at your watch for just one During that time,The popuiation of the world increased by Perhaps you think that is Hoever,during the next hour,over15540 more babies will be born on the So it goes on,hour after In oneday,people have to produce food fover 370000 more Multiply this justthink how many more there will be in one year!What will happen in a hundred years? The increasing population may be the greatest challenge of the world The world's population is growing faster and Two thousang years ago,there only 250millon people on the At the beining of the20thcentury,the world'spopulation was about In 1990,it reached more than five Now at the beininjg of the 21stcentthe world's population has passed six people say that by the yeay 2010it may be seven That means in about 600 years,there will br standing room only on the Each person will have one half to one square metre of space to live There will be hardly enough space ror angbody It has been estimated that a thousand years ago there were less than 400 million people on However, in the recent thousand years human population has increased nearly 20 Nowadays the world population has reached more than 7000 The population explosion has caused many Generally, they come down to four major First, a lot of people can't get employment, which is a universal problem in the Second, in developing countries there are not enough shelters for too many people and so people are not properly housed and even are exposed to the Third, in underdeveloped countries a lot of people suffer from hunger because of food shortage, which in turn causes many other problems, malnutrition, disease, Fourth, there are not enough schools for so many people and so a lot of people are Therefore, to eliminate these problems, human beings should take effective measures to control